People say they should always watch their thoughts when it arises and remain Empty.

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People say they should always watch their thoughts when it arises and remain Empty. The thinker is the ego. Without the ego there is no thinker. Until the ego is there the thinker is bound to be there.  Until thinker is there the thought is bound to rise.   Thus watching the thoughts will not yield any fruits.

When one is aware of the fact that, the thinker and his thoughts are part of the illusion and the self is neither thinker nor the thought, but one which is aware of the thinker and the thought together without the physical apparatus. 

When the self is neither the ego nor the body how can one experience anything which is exist prior to the experience of form, time and space.   

The mind becomes still only when one becomes aware of the fact that, the form, time and space are one in essence.  When one realizes the form, time and space are one in essence than the self is in its own awareness of   its formless nondual nature. When the self (Atma nor consciousness) is in its own awareness the mind becomes till without the thinker and without the thoughts in the midst of diversity.